I was told by multiple staffers at Roto Grip that color did matter. That is why Roto Grip tends to stay away from orange and yellow and stick more with red, black, blue. The more color you add, the more the pores are smaller. Its the same with mixing colors for printing. Once you get past the cyan, magenta, and yellow color pallet, the chemical chain is different. The more color, the smaller the pores. (In broadcasting, they broadcast in red, green, and blue)